linux-kernel - Re: Regression in v4.2-rc1: vmalloc_to

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Message-ID: <1437576873.3214.248.camel@hp.com>
Date:	Wed, 22 Jul 2015 08:54:33 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Ashutosh Dixit <ashutosh.dixit@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Dutt, Sudeep" <sudeep.dutt@...el.com>,
	"Rao, Nikhil" <nikhil.rao@...el.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap

On Wed, 2015-07-22 at 00:13 -0700, Ashutosh Dixit wrote:
> On Tue, Jul 21 2015 at 01:39:10 PM, Toshi Kani <toshi.kani@...com> wrote:
> > 
> > You can do the following instead.  If you have the physical address 
> > already
> > (i.e. the address you passed to ioremap), you can skip 
> > slow_virt_to_phys().
> >  pfn_to_page() is a hack for the time being so that you can use the 
> > same
> > DMA mapping APIs.
> > 
> >   phys = slow_virt_to_phys(vaddr);
> >   page = pfn_to_page(phys >> PAGE_SHIFT);
> > 
> > Dan is working on the change to introduce __pfn_t.  With this change, 
> > you
> > can pass a pfn, instead of a fake page pointer, to APIs.  You may want 
> > to
> > check if your APIs are covered in this change.
> > https://lkml.org/lkml/2015/6/5/802
> 
> Thanks, we can do this for now till Dan's changes come online. Also, we
> already have the physical address. We will submit a patch with this
> change.

Sounds great.  Thanks,
-Toshi
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